\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}\zeta(s+1)-\zeta(s)= \sum_n^\infty \frac {1}{(n+1)^s} - \sum_n^\infty \frac {1}{n^s}\end{equation*}
\end{document}
